A true friend is one soul in two bodies.

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The cultivation of the intellect is man's highest good and purest happiness.

The mathematical sciences particularly exhibit order symmetry and limitations; and these are the greatest forms of the beautiful.

Now each man judges well the things he knows, and of these he is a good judge. And so the man who has been educated in a subject is a good judge of that subject, and the man who has received an all-round education is a good judge in general.

Jealousy is both reasonable and belongs to reasonable men, while envy is base and belongs to the base, for the one makes himself get good things by jealousy, while the other does not allow his neighbour to have them through envy.

To give a satisfactory decision as to the truth it is necessary to be rather an arbitrator than a party to the dispute.

The worst form of inequality is to try to make unequal things equal.

Poetry utters universal truths, history particular statements.

They are fond of fun and therefore witty, wit being well-bred insolence.

Philosophy can make people sick.

If, however, the poetic end might have been as well or better attained without sacrifice of technical correctness in such matters, the impossibility is not to be justified, since the description should be, if it can, entirely free from error.

Some thinkers hold that it is by nature that people become good, others that it is by habit, and others that it is by instruction. . . just as a piece of land has to be prepared beforehand if it is to nourish the seed, so the mind of the pupil has to be prepared in its habits if it is to enjoy and dislike the right things.

The man who is isolated, who is unable to share in the benefits of political association, or has no need to share because he is already self-sufficient, is no part of the polis, and must therefore be either a beast or a god.

For both excessive and deficient exercise ruin bodily strength, and, similarly, too much or too little eating or drinking ruins health, whereas the proportionate amount produces, increases, and preserves it.

Happiness is the meaning and the purpose of life, the whole aim and end of human existence.